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Old April 21st, 2013, 10:41   #4
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Cliffradical's Avatar
Join Date: Jun 2010
Location: Winnipeg
8mm sort of still exists as a parallel standard for some guns (mostly collector models now), but it was never really feasible for use as a skirmishing caliber because the bbs themselves are simply too massive to use on a person at that point.

6mm has become the dominant standard partially because of many companies saving massive amounts of money on R & D by directly copying Tokyo Marui design elements, and more recently because a 6mm bb carries optimal ballistic properties given the speeds and distances at which we shoot them.
4mm is too small to carry enough mass in polymer mediums to be effective, 8mm is dangerous once it's got up to speeds deemed effective in skirmishing.
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